Tape guide angle controlling apparatus for magnetic tape recorder-player

ABSTRACT

A tape guide angle controlling apparatus for controlling an orientation of a tape guide in a magnetic tape recorder-player includes a main base, a shaft bushing provided in the main base and having a shaft hole formed in the center thereof, a tape guide arm having at one end portion thereof a rotation shaft rotatably inserted into the shaft hole and at the other end portion thereof having a tape guide, a tape guide horizontal-rotating mechanism for horizontally rotating the tape guide arm, and a tape guide vertical-operating mechanism driven by the tape guide horizontal-rotating member for vertically moving the tape guide arm. The apparatus slants the tape guide which guides a magnetic tape in a reverse running mode, thereby improving the magnetic tape running operation in a reverse running mode.

This application is a divisional of application Ser. No. 08/701,576,filed on Aug. 22, 1996, now U.S. Pat. No. 5,901,011, the entire contentsof which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a magnetic tape recorder-player, andmore particularly, to a tape guide angle controlling apparatus for amagnetic tape recorder-player which maintains a desired tape runningangle during either forward running or reverse running of the tape so asto improve tape running in both cases.

2. Description of Related Art

As shown in FIG. 1, a conventional tape running device in a magnetictape recorder-player includes a supply guide unit 400 provided on thepath along which a tape T is transferred from a supply reel 1 onto ahead drum 4, and a roller guide unit 500 provided on the path alongwhich the tape T is transported from the head drum 4 onto a takeup reel9.

After sequentially passing a first post PO, a tension post 2, a secondpost P1, a full-erase head 3, a roller P2 and a first slant post SP ofthe supply guide unit 400, the tape T is supplied to the head drum 4.

The roller guide unit 500 includes a second slant post TP, anotherroller P3, and audio/control head 5, a third post P4, a capstan 6, apinch roller 7 and a tape guide 8.

When the tape T is run forward, the tape T runs along the guide units400 and 500 in the above-described sequence. When run in reverse, thetape T runs in the reverse sequence.

The roller P2, the first slant post SP, the roller P3 and the secondslant post TP each enable the tape T to be drawn out, so that the tape Tcan be wrapped onto the headdrum 4.

In the tape running cycle of the conventional magnetic tape recorderdescribed above, the tape guide 8 serves to guide the tape T during boththe forward and reverse tape running modes.

The structure for driving the tape guide 8 in the roller guide unit 500will now be described.

Referring to FIG. 2, a pivot shaft 11 is mounted on a main base plate10. A roller arm 12 is rotatably mounted at a hub end thereof on thepivot shaft 11. The tape guide 8 is vertically mounted on the distal endof the roller arm 12. A projection 12' is formed beneath the roller arm12.

When the tape T is in a forward running mode, the tape guide 8 guidesthe tape T transferred past the capstan 6 thereto to be wound on thesupply reel 9. In the reverse running mode, the tape guide 8 serves toregularly transfer, at a certain angle, the tape T from the takeup reel9 to the capstan 6.

To operate the roller arm 12 having the tape guide 8 mounted at its oneend, as shown in FIGS. 3A through 3C, there is provided a firstconnection gear 14 engaged to a gear 13' serving as a rotation shaft ofa driving source 13. Also, there is provided a second connection gear 15which is engaged to the first connection gear 14, and a cam gear 16which is engaged to the second connection gear 15 for transmitting thedriving force to the roller arm 12.

On a portion along the periphery of the cam gear 16 a cam arc projection16' is formed for holding and driving the roller arm 12.

A lever recess 20 is formed at an outer edge surface of a function slide17. Function slide 17 includes a rack gear 18 formed internally thereinengaged to the third connection gear 19. Third connection gear 19 isalso engaged to the cam gear 16. A brake protrusion 22 formed at one endportion of a supply reel brake lever 21 movably contacts the outer edgesurface of the function slide 17 and follows along the outer edgesurface of the function slide 17 to the lover recess 20, whereby anappropriate tension is applied to the tape T wound on the supply reel 9.Reference numeral 23 denotes a brake spring.

Among the operations of the conventional tape guide angle controllingapparatus in accordance with the conventional magnetic taperecorder-player, the forward running of the tape T will be firstdescribed.

The tape T supplied from the supply reel 1 is transferred to the headdrum 4 by sequentially passing the first post PO, the tension post 2,the second post P1, the full-erase head 3, the roller P2 and the firstslant post SP.

Then, the tape T moves via the roller guide unit 500 to the takeup reel9. In the roller guide unit 500, the tape T sequentially passes thesecond slant post TP, the roller P3, the audio/control head 5, the thirdpost P4, the capstan 6, the pinch roller 7 and the tape guide 8. At thistime, the tape guide 8 moves according to the operation of the rollerarm 12.

The cam gear 16 is driven by the operation of the second connection gear15. Second connection gear 15 is engaged to the first connection gear14, which is in turn engagedly powered by the shaft gear 13' extendedfrom the driving source 13. With the rotation of the cam gear 16, a camarc tip 16", formed along the periphery of the cam arc projection 16',pushes the arm projection 12' on the roller arm 12 so that the rollerarm 12 is rotated clockwise, whereby the roller arm 12 as shown in FIG.3A moves to the location thereof shown in FIG. 3B.

The third connection gear 19, which is engaged with the cam gear 16 andalso with the rack gear 18 in the function slide 17, drives the functionslide 17 from the position shown in FIG. 3A to the right.

To control the tape guide angle in the conventional magnetic taperecorder-player, when the tape T is run forward, the brake protrusion 22provided at the end of the takeup reel brake lever 21 does not reach thelever recess 20, so the takeup reel 9 can rotate freely because it isnot contacted by the takeup reel brake lever 21.

When the takeup reel 9 is not contacted by the takeup reel brake lever21, the tape guide 8 at the end of the roller arm 12 guides the tape Tfrom between the capstan 6 and the pinch roller 7 so as to be regularlywound onto the takeup reel 9. Meanwhile, when run in reverse, the tape Treleased from the takeup reel 9 and past the tape guide 8 is guided inthe reverse direction compared to the forward running mode.

In the reverse running of the tape T, the tape guide 8 maintains thetape T released from the takeup reel 9 at a certain angle and guides thetape T to the capstan 6. The operation of the tape guide 8 will bedescribed hereunder.

First, when the cam gear 16 and the cam arc projection 16' thereon aredriven by the driving source 13, the cam arc projection 16' contacts thearm projection 12' on the roller arm 12 as shown in FIG. 2. Then, thearm projection 12' on the roller arm 12 contacts the cam arc tip 16'" ofthe cam arc projection 16'.

The third connection gear 19 engaged to the cam gear 16 is operated soas to move the function slide 17 to the right as shown in FIG. 3C.

When the function slide 17 moves to the right, the brake protrusion 22at the end of the takeup reel brake lever 21 becomes positioned in thelever recess 20. Therefore, the other end of the takeup reel brake lever21 contacts the periphery of the takeup reel 9, thereby controlling therotation rate of the takeup reel 9.

The control of the speed of takeup reel 9 adds an appropriate initialtension to the tape T being unwound from the takeup reel 9.

Meanwhile, during forward running, the tape guide 8 maintains anappropriate tension on the tape T while enabling the tape T to beregularly wound onto the takeup reel 9. At this time, to properly guidethe tape T from capstan 6, the tape guide 8 should be perpendicular tothe main base plate 10. When running in reverse, the tape T having anappropriate tension thereon corresponding to the braking of the takeupreel brake lever 21 is supplied to the tape guide 8.

However, in the tape guide angle controlling apparatus in theconventional magnetic tape recorder-player, when running in reverse, sothat the supply reel 1 receives the tape T, because of the long taperunning path between the supply reel 1 and the capstan 6 fortransporting the tape T, the tape running state becomes weakened whenpassing over the head drum 4, the first slant post SP and the secondslant post TP, because of the long tape running path between the supplyreel 1 and the capstan 6 for transporting the tape T. Therefore, thetape T contacted to the third post P4 and the audio/control head 5 mayexperience fluctuation perpendicularly to the tape running direction.

Therefore, the conventional tape guide angle controlling apparatus hasdisadvantages in that when the position of tape T fluctuates whenrunning in reverse mode, the tape T can be damaged. Also, when the tapemode changes back to a forward running, the positional fluctuation oftape T causes delays in audio signal reproduction by the audio/controlhead 5 because head 5 cannot accurately reproduce signals from the tape.

SUMMARY OF THE INVENTION

Therefore, it is an object of the present invention to provide a tapeguide angle controlling apparatus for a the tape guide of a magnetictape recorder-player that is capable of variably slanting the tape guidedepending on whether the recorder-player is in a forward running mode ora reverse running mode of the tape.

It is another object of the present invention to guide the tape stablyin the reverse running mode.

To achieve the above-described objects, a tape guide angle controllingapparatus according to the present invention comprises a main base, abushing provided in the main base and having a vertical shaft hole in acenter thereof, a tape guide arm having at one end portion thereof arotation shaft rotatably inserted into the shaft hole of the bushing andat another end portion thereof having a tape guide, a tape guidehorizontal-rotating means driven for horizontally rotating the tapeguide arm, and a tape guide vertical-operating means driven by the tapeguide horizontal-rotating means and vertically operating the tape guidearm.

Further, the tape guide angle controlling apparatus according to thepresent invention comprises a main base, a rotation shaft provided inthe main base, a tape guide arm having at one end portion thereof a hubthrough which the rotation shaft is rotatably inserted and at anotherend portion thereof a tape guide mounted thereto, a cam gear mounted onan upper surface of the main base, and a tape guide vertical-operatingcam means formed on a portion of a peripheral edge of the cam gear.

Still further, the tape guide angle controlling apparatus according tothe present invention comprises a tape guide means including an uprighttape guide for being contacted to a magnetic tape for guiding a forwardand reverse tape running, and a control means for operating the tapeguide means so that the uprightness of the tape guide to which the tapeis movably contacted can be varied from the vertical.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a conventional magnetic tape running system;

FIG. 2 is a cross-sectional view showing a conventional tape guidestructure;

FIG. 3A is a plan view showing a stationary state in a magnetic taperunning cycle, including a conventional tape guide angle controllingapparatus of a tape guide.

FIG. 3B is a plan view showing the conventional tape guide anglecontrolling apparatus of the tape guide in a forward running mode;

FIG. 3C is a plan view showing the conventional tape guide anglecontrolling apparatus of the tape guide in a reverse running mode;

FIG. 4A is a plan view showing a tape guide angle controlling apparatusof a tape guide in accordance with a first embodiment of the presentinvention in a forward running mode;

FIG. 4B is a plan view showing the tape guide angle controllingapparatus of the tape guide in accordance with the first embodiment ofthe present invention in a reverse running mode;

FIG. 5A is a cross-sectional view taken along the line Va--Va in FIG.4A, showing the tape guide in accordance with the first embodiment ofthe present invention;

FIG. 5B is a cross-sectional view taken along the line Vb--Vb in FIG.4B, showing the tape guide in accordance with the first embodiment ofthe present invention;

FIG. 6A is a plan view showing a forward running state of the magnetictape recorder for describing the operation of the tape guide inaccordance with the first embodiment of the present invention;

FIG. 6B is a plan view showing a reverse running state of the magnetictape recorder for describing the operation of the tape guide inaccordance with the first embodiment of the present invention;

FIG. 7 is a partial cross-sectional view showing a bushing structure ofa tape guide angle controlling apparatus in accordance with the firstembodiment of the present invention;

FIG. 8A is a plan view of a cam gear for operating a tape guide armprovided with a tape guide angle controlling apparatus in accordancewith a second embodiment of the present invention;

FIG. 8B is a cross-sectional view taken along the line VIIIb--VIIIb inFIG. 8A;

FIG. 9A is a plan view showing a tape guide in accordance with thesecond embodiment of the present invention in an unloaded mode;

FIG. 9B is a plan view showing the tape guide in accordance with thesecond embodiment of the present invention in a forward running mode;

FIG. 9C is a plan view showing the tape guide in accordance with thesecond embodiment of the present invention in a reverse running mode;

FIG. 10A is a cross-sectional view showing g a tape guide state in aforward running mode for illustrating the tape guide angle control inaccordance with the second embodiment of the present invention; and

FIG. 10B is a cross-sectional view showing a tape guide state in areverse running mode for illustrating the tape guide angle control inaccordance with the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to the accompanying drawings, a tape guide anglecontrolling apparatus for a tape guide in accordance with a firstembodiment of the present invention includes a main base 129 (see FIG.5A), a tape guide arm 131, a rotation shaft 132, a bushing 140, a tapeguide horizontal-rotating member and a tape guide vertical-operatingmember. Each of the above components will be detailed in the followingdescription. In addition, audio/control head 5 and third post P4 (see,for example, FIG. 4A) correspond to audio/control head 105 and thirdpost P4 as described above relative to the description of theconventional art.

The bushing 140 is insertingly mounted in the main base 129 and, asshown in FIG. 7, a shaft hole 140' is formed through the center of thebushing 140, perpendicular to the main base 129.

The shaft hole 140' includes a vertical support portions 141 forvertically supporting the tape guide 130 provided at the end of the tapeguide arm 131 by vertically sustaining a rotation shaft 132 which is setin the shaft hole 140', and a slant support portions 142 slanted at acertain angle relatively to the main base 129 so as to tiltingly sustainthe rotation shaft 132.

As shown in FIG. 7, the vertical support portions 141 and the slantsupport portions 142 are commonly symmetrical to the central point H ofthe bushing 140.

A position orienting projection 144 is formed on the outer periphery ofthe bushing 140 so that the slant support portions 142 can be orientedalong the line Va--Va (see FIG. 4A) when the bushing 140 is mounted inthe base 129 which has a recess therein (not shown) for receiving theposition orienting projection 144.

On the lower surface of the tape guide arm 131 there is formed an armprojection 131', as shown in FIGS. 5A and 5B, which is engageable by thecam gear 116. On one end of the tape guide arm 131 there is mounted atape guide 130 for guiding the tape T. The rotation shaft 132 isrotatably inserted through the other end of the tape guide arm 131 andthe shaft hole 140' formed through the center of the bushing 140.

The tape guide horizontal-rotating member for horizontally rotating thetape guide arm 131 in cooperation with the driving source 113 mounted onthe main base 129 includes a first and second connection gears 114, 115and a cam gear 116 engaged with the second connection gear 115. A camarc projection 116' for rotating the tape guide arm 131 is provided on aportion of the peripheral edge of the cam gear 116.

The tape guide vertical-operating member for vertically driving the tapeguide arm 131 in cooperation with the driving source 113 includes afunction slide 170 installed on the main base 129 and having a guideslot 171, and a vertical operating lever 150 (see, especially, FIG. 6A)pivotably installed on the main base 129. On one end portion of whichlever 150 there is formed a projection 153 guided in the guide slot 171of the function slide 170 as shown in FIG. 6A, and on the other endportion of the lever 150 is formed a pair of fork arms 151,152 whichengage with the rotation shaft 132.

The guide slot 171 in function slide 170 is provided with a straightportion 171' generally parallel to the moving direction of the functionslide 170 and an angled portion 171" inclined relative to the movingdirection of the function slide 170.

The first fork arm 151 serves to position the tape guide 130 to beperpendicular to the main base 129. The second fork arm 152 is providedfor pushing the rotation shaft 132 to on side so that the tape guide 130can be slanted relative to the main base 129. The reference numeral 172denotes a rack gear formed in the function slide 170 and referencenumeral 173 indicates a recess in the function slide 170.

The operation of the thusly composed tape guide angle control apparatusin accordance with the first embodiment of the present invention willnow be described.

First, when the tape T is run forward, driving force from the drivingsource 113 is transmitted via a worm gear 113' to the meshed first andsecond connection gears 114, 115 to the cam gear 116, so that the armprojection 131' on the tape guide arm 131 is engaged by cam arc tip 116"at one end of the cam arc 116' of the cam gear 116 as shown in FIG. 4A.At this time, the function slide 170 is moved by the pinion gear 119engaged to the cam gear 116 and the projection 153 on the verticaloperation lever 150 is positioned in the straight portion 171' of theguide slot 171. As shown in FIG. 5A, the first fork arm 151 comes tosupport the rotation shaft 132 and accordingly the shaft 132 contactsthe vertical support portions 141 in the bushing 140.

Consequently, the tape guide 130 is placed vertical to the main base129, thus easily guiding the forward running tape T. At this time, asshown in FIG. 4A, a brake protrusion 122 at the tip of a takeup reelbrake lever 121 rides on an edge surface of the function slide 170 awayfrom the recess 173, whereby the other end of the takeup reel brakelever 121 remains spaced from the periphery of the takeup reel 109.

As shown in FIG. 4B, when the tape T is run in reverse, driving forcefrom driving source 113 is transmitted via the meshed first and secondconnection gears 114, 115 to the cam gear 116, so that the pinion gear119 is engagedly driven by the cam gear 116 and the function slide 170moves to the right.

In accordance with the movement of the function slide 170 to the right,the projection 153 on the vertical operation lever 150 is guided intothe angled slot portion 171', whereby the vertical operation lever 150pivots anti-clockwise. Then, as shown in FIG. 5B, the second fork arm152 pushes the rotation shaft 132 to one side so that it becomessupported by the slant support portions 142. As a result, the tape guide130 becomes slanted at a certain angle corresponding to the angle of thevertical support portions 141.

The slanting of the tape guide 130 to one side by a predetermined angleθ (see FIG. 5B) causes the tape T released from the takeup reel to beregularly transferred to the capstan 106, thereby improving the reverserunning operation of the tape T.

Also, the brake protrusion 122 at the end of the takeup reel brake lever121 becomes positioned in the recess 173 and the takeup reel brake lever121 contacts the takeup reel 109, whereby the rotation of the takeupreel 109 is controlled. As a result, the tension on tape T as it isunwound from the takeup reel 109 is maintained at a certain value.

FIGS. 6A and 6B illustrate the mechanism of the vertical operation lever150 for vertically operating the tape guide arm 131 and including theguide hole 171 in the function slide 170.

With reference to the accompanying drawings, the tape guide anglecontrolling apparatus in accordance with the second embodiment of thepresent invention will now be described.

As shown in FIGS. 8 through 10, the tape guide angle controllingapparatus in accordance with the second embodiment of the presentinvention has at one end portion of a tape guide arm 225 a verticallymounted tape guide 226 for guiding the tape T and at the other endportion thereof a hub 227 is provided which is rotatably mounted on arotation shaft 228 connected to a main base (not shown).

A cam gear 220 is installed on the main base plate (not shown) and a camfor driving the tape guide arm 225 is formed on the cam gear 220.

A tape guide vertical-operating member employed in the second embodimentof the present invention is provided on the cam gear 220 for driving thetape guide arm 225.

As shown in FIGS. 8A and 8B, the tape guide vertical-operating memberincludes a forward running cam portion 221 and a reverse running camportion 222 each provided on the peripheral edge of the cam gear 220 soas to change the vertical angle of the tape guide 226.

As shown in FIG. 8B, the reverse running cam portion 222 projectsupwardly by a certain height above the surface level of the forwardrunning cam portion 221. When the tape T is run in reverse, the reverserunning cam portion 222 contacts a lower surface portion of the tapeguide arm 225, thereby raising the tape guide arm 225. As a result, thetape guide 226 is raised and tilted by a certain angle appropriate forthe reverse running mode of the tape T.

The reverse running cam portion 222 is formed as a molded leaf spring toprevent over-loading and is extended along the periphery of the cam gear220 from the forward running cam portion 221, thereby having an elasticproperty.

As shown in FIGS. 9A through 9C, at one end portion of the tape guidearm 225 the tape guide 226 is provided and at the other end portionthereof the hub 227 connected to the main base (not shown) is provided,through which the shaft 228 extends. An arm projection 225' extends fromthe lower surface of the tape guide arm 225.

In the embodiment as shown in FIGS. 10A and 10B, the hub .O slashed.H ofthe rotation shaft housing 227 is formed slightly larger than thediameter .O slashed.S of the shaft 228, so that the tape guide arm 225can be rotated easily on the shaft 228 and at the same time the tapeguide arm 225 can be tilted using the hub 227 as a pivot due to the gapbetween the inner diameter .O slashed.H of the hub 227 and the diameter.O slashed.S of the shaft 228.

Therefore, by tilting the tape guide arm 225, the angle and height ofthe tape guide 226 at the end of the tape guide arm 225 is controlled.

The operation and effect of the tape guide angle controlling apparatusin accordance with the second embodiment of the present invention willnow be explained, as follows.

First, by the operation of the cam gear 220, the tape guide arm 225 ispushed upwardly by the tape guide vertical-operating member provided onthe peripheral edge of the cam gear 220 and tilted by using the hub 227as a pivot. Accordingly, the tape guide 226 guides the tape T in thereverse running mode.

More specifically, as shown in FIGS. 9B and 10A, in the forward runningmode in which the cam gear 220 is driven counter-clockwise, cam arc tip221' at the end of the forward running cam portion 221 pushes againstthe arm projection 225' on the tape guide arm 225. This horizontallyrotates the tape guide arm 225 clockwise. At this time, the tape guide226 remains vertical and perpendicular to the main base (not shown).

Referring to FIGS. 9C and 10B, in the reverse running mode, the cam 220is rotated clockwise and the surface of the reverse running cam portion222 (which is higher than the forward running cam portion 221) contactsthe lower surface of the tape guide arm 225. The tape guide arm 225 isthereby tiltingly raised to a certain height in accordance with the gapbetween the inner diameter .O slashed.H of the hub 227 and the diameter.O slashed.S of the shaft 228. That is, when the tape guide arm 225 israised by the reverse running cam portion 222, the lower portion of theshaft 228 contacts a right side lower portion of the hub 227 and theupper portion thereof contacts a left side upper portion of the hub 227,whereby the hub 227 and the tape guide 226 at the end of the tape guidearm 225 are tilted by a certain angle θ relative to the vertical.

As shown in FIGS. 10A and 10B, the tape guide arm 225 can be tiltinglyraised using the hub 227 as a pivot due to the gap between the diameters.O slashed.H and .O slashed.S.

Because the tape guide arm 225 must be formed so as to be rotatableabout the axis of the shaft 228, the inner diameter .O slashed.H of thehub 227 is made larger than the diameter .O slashed.S of the shaft 228.

The second embodiment of the present invention is directed to slatingthe tape guide 226.

Additionally, the reverse running cam portion 222 is formed on theperipheral edge of the cam 220 so as to extend from the forward runningcam portion 221, and is formed as a molded left spring so as to have anelastic property.

Also, making the reverse running cam portion 222 elastically resilientprevents the tape guide arm 225 from being over-loaded.

As described above, the tape guide angle controlling apparatus of thepresent invention can improve tape running during forward and a reverserunning modes because of a certain angle made by the tape guide againstthe main base.

Further, the improved tape running property at forward and reverserunning modes prevents magnetic tape damage and audio signal delay.

What is claimed is:
 1. A tape guide angle controlling apparatus for amagnetic tape recorder-player for tilting a tape guide which guidesmagnetic tape in a reverse running mode, comprising:a main base; arotation shaft provided in the main base; a tape guide arm having at oneend portion thereof a hub through which the rotation shaft is rotatablyinserted and at another end portion thereof a tape guide mountedthereto; a cam gear mounted on an upper surface of the main base andbeing operatively connected to said tape guide arm; and a tape guidevertical-operating cam means formed on a portion of a peripheral edge ofthe cam gear for inclining said tape guide to said upper surface of themain bases wherein the tape guide vertical-operating cam means includesa forward running cam portion and a reverse running cam portion, eachfor varying an angle of the tape guide depending upon a tape runningmode, wherein the reverse running cam portion is formed higher than theforward running cam portion so as to tilt the tape guide to a desiredextent when the reverse running cam portion contacts a lower surface ofthe tape guide arm to thereby raise the tape guide arm.
 2. The apparatusof claim 1, wherein an inner diameter of the hub of the tape guide armis formed larger than a diameter of the rotation shaft, whereby the tapeguide arm may be wobbled on the rotation shaft using the hub as a pivotfor slanting the tape guide.
 3. An apparatus for controlling an angle atwhich a tape guide in a magnetic tape recorder-player is slantedrelative to vertical, comprising:a main base; a rotation shaft mountedon said main base; a tape guide arm rotatably and tiltably mounted onsaid rotation shaft at a first end and having a tape guide formed at asecond end; and a cam gear rotatably mounted on said main base andincluding a cam portion, said cam portion including a forward runningportion and a reverse running portion formed higher than said forwardrunning portion, said cam gear being arranged relative to said tapeguide arm such that, in a reverse running mode of the taperecorder-player, said cam gear is rotated so that said reverse runningportion of said cam portion contacts said tape guide arm, causing saidtape guide arm, and in turn, said tape guide to tilt.
 4. The apparatusof claim 3, wherein, in a forward running mode, said cam gear is rotatedso that said forward running portion of said cam portion is placedopposite said tape guide arm without contacting said tape guide arm,thereby maintaining said tape guide arm, and in turn, said tape guide ina vertical position.
 5. The apparatus according to claim 3, wherein saidtape guide arm includes a hub at said first end, said hub having a boreformed therein for receiving said rotation shaft whereby said tape guidearm is rotatably mounted, a diameter of said bore being larger than adiameter of said rotation shaft, whereby said tape guide arm is tiltablerelative to said rotation shaft.
 6. The apparatus of claim 5, whereinsaid reverse running portion includes a resilient portion to preventover-loading said tape guide arm and extends continuously from saidforward running portion.